package com.heima.search.service.impl;

import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.search.dtos.UserSearchDto;
import com.heima.model.user.pojos.ApUser;
import com.heima.search.service.ApUserSearchService;
import com.heima.search.service.ArticleSearchService;
import com.heima.utils.thread.AppThreadLocalUtil;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.lucene.util.QueryBuilder;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.stereotype.Service;

import javax.naming.directory.SearchResult;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Service
@Slf4j
@RequiredArgsConstructor
public class ArticleSearchServiceImpl implements ArticleSearchService {

    private final RestHighLevelClient restHighLevelClient;
    private final ApUserSearchService apUserSearchService;

    /**
     * 文章检索
     * @param dto
     * @return
     */
    @Override
    public ResponseResult search(UserSearchDto dto) throws IOException {
        //1.检查参数
        if(dto == null || StringUtils.isBlank(dto.getSearchWords())) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        //异步调用保存搜索历史记录
        ApUser user = AppThreadLocalUtil.getUser();
        if (user != null && dto.getFromIndex() == 0) {
            apUserSearchService.insert(dto.getSearchWords(), user.getId());
        }

        //2.设置查询条件
        SearchRequest searchRequest = new SearchRequest("app_info_article");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //布尔查询构造器
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        //关键字分词之后查询
        QueryStringQueryBuilder queryStringQueryBuilder = QueryBuilders.queryStringQuery(dto.getSearchWords()).field("title").field("content").defaultOperator(Operator.OR);
        boolQueryBuilder.must(queryStringQueryBuilder);

        //查询小于mindate的数据
        RangeQueryBuilder publishTime = QueryBuilders.rangeQuery("publishTime").lt(dto.getMinBehotTime().getTime());
        boolQueryBuilder.filter(publishTime);

        //分页查询
        searchSourceBuilder.from(0);
        searchSourceBuilder.size(dto.getPageSize());

        //按照发布时间倒序查询
        searchSourceBuilder.sort("publishTime", SortOrder.DESC);

        //设置高亮 title
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        highlightBuilder.preTags("<font style='color: red; font-size: inherit;'>");
        highlightBuilder.postTags("</font>");
        searchSourceBuilder.highlighter(highlightBuilder);

        //条件构造完毕，根据构造条件进行es查询
        searchSourceBuilder.query(boolQueryBuilder);
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

        //3.结果封装返回
        List<Map> list = new ArrayList<>();
        SearchHit[] hits = searchResponse.getHits().getHits();
        for (SearchHit hit : hits) {
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            //处理高亮
            if(hit.getHighlightFields() != null && hit.getHighlightFields().size() > 0) {
                Text[] titles = hit.getHighlightFields().get("title").getFragments();
                String title = StringUtils.join(titles);
                //高亮标题
                sourceAsMap.put("h_title", title);
            } else {
                //原始标题
                sourceAsMap.put("h_title", sourceAsMap.get("title"));
            }
            list.add(sourceAsMap);
        }
        return ResponseResult.okResult(list);
    }
}
